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tube

  1. R

    Hickok 600a rectifier socket question

    Hello fine folks at AK. I read posts here from time to time but now have a question. I am an old guitar guy that employs tube amps exclusively. Picked up a hickok 600a and was hoping to use it. Someone had previously replaced the 5y3gt tube socket and they did a poor job of it. Well I put a new...
    • Reicksta
    • Thread
    • 600a rectfier tester hickok tube
    • Replies: 7
    • Forum: Tube Audio
  2. zastin17

    My First Amplifier Build!! 6L6/6P3s Push Pull Stereo

    This is my very first tube build ever. And I can't believe I did it!! I'm only 22 years old, so I'm very young and new to this Tube design thing. I have learned so mutch and now I'm addicted.... Now I can say without a doubt in my mind that my scratch built 6L6 Push Pull Stereo Tube Amplifier...
    • zastin17
    • Thread
    • 6l6 amplifier diy el34 solder stereo tube utilitarian
    • Replies: 20
    • Forum: Tube Audio
  3. MartyGee666

    Directly heated rectifiers

    Heyo, I'm working with 5U4 rectifier tube, and I'm getting close to 100v AC on the rectifier heaters. With no tubes I'm getting 3.5v on the power and pre-amp tubes, but the rectifier, is way out of spec from the 5v I believe I should be getting. Is there something I'm missing, it being a...
    • MartyGee666
    • Thread
    • 5u4 directly heated heaters rectifier tube
    • Replies: 16
    • Forum: Tube Audio
  4. barrynsue

    McIntosh MC240 and 275 Tube Cage sizes

    I have this McIntosh cage and while I thought it was for a 240, now I’m not sure. Approx measurement below: L - 13.25” H - 4” D - 4.75” Any help is appreciated as I no longer have either to check. Thanks folks.
  5. radiotubes

    Crown A-30 mono tube amplifier EL37

    These are somewhat rare and not easy to evaluate. The A-30 30 stereo version appears on internet searches more frequently. My guess:$500-$800. Anyone ever see these sell or have an idea of value?
  6. Mr.Brian

    New Tech needs help with Alamo Galaxie tube amp

    Hey fellas, hope I am posting this in the correct place. Just need a little help if possible. I have not been able to find a schematic for the Alamo Galaxie anywhere. I have heard one does not exist but I do have the Montclaire schematic which I have also been told is very close to the Galaxie...
    • Mr.Brian
    • Thread
    • alamo amp galaxie tube vintage
    • Replies: 13
    • Forum: Tube Audio
  7. artsybob

    Replacing Speaker Screw Terminals + Phono Input Interference

    I've really been enjoying my Realistic SAF-40D tube integrated amp over the past four years, however the worst part of the amp's design, and that of most other amps of the 1960's, is that I hate the tiny speaker screw terminals on the back. It makes plugging the speaker cables in a huge chore...
    • artsybob
    • Thread
    • 7189 integrated amplfier realistic saf-40d tube
    • Replies: 5
    • Forum: Tube Audio
  8. Tuned

    Jolida 801 V4 & V5 Tubes not powering on

    I'm new to the forum and looking for some tips to help troubleshooting. I've had my Jolida 801 for about four years. It's worked great but today two of the tubes are not powering up. Ports V4 and V5. I put a basic multimeter on to check each tube ,as per the manual bias guide, and no voltage...
  9. Zach Nelson

    Using variac always with Scott 222c

    I heard a guy say that he always runs hit Scott through a variac to keep it at 117v. Is there any real reason for this? I understand wall sockets can be 120-125v, just curious if that was enough to damage a amp that has be restored.
  10. goldswimmerb

    Struggling with an ST-70

    Hey, looking for some help here as this thing is whooping my butt... I have an ST-70 I am trying to get up and running properly, from what I've been told it worked just fine for a while then one day started "flashing then popping a fuse".... I've been going through and checking everything but I...
  11. James Cox

    Pilot 240 motorboating

    Alright so ive got a real stumper here. I purchased a pilot 240 integrated tube amp a couple of years ago from a kid on clist who had been using it as a bass guitar amp. When i got it one of the powertubes was redplating and there would be a crazy thumping, motorboat sound. This was my first...
    • James Cox
    • Thread
    • help integrated amp motorboating pilot redplating repair thumping tube
    • Replies: 49
    • Forum: Tube Audio
  12. Zack Sainz

    Scott 299B Tube Rolling

    Hey all! Happy New Year! Using my Scott with recapped KLH 5s, this pairing makes me quite happy! But now, I think it’s time to roll! I replaced my JJ output tubes with 6P14P-ER Gold Grids and they sound great! (I’m definitely going to buy another set as a back up) Next up: 6u8: I haven’t...
    • Zack Sainz
    • Thread
    • scott scott 299b suggestions tube tube rolling
    • Replies: 3
    • Forum: Tube Audio
  13. zastin17

    "Tube life" Anxiety Caused By Using My Amplifier

    So something has been really driving me crazy!! And that is using my Tube Amplfier, and finding myself way overally worrying about the tubes on my Dynaco St-70. (Which I fully restored) I love the sound, and I love everything about tubes and I'm a bit "emotionally" Obsessed with them and get...
    • zastin17
    • Thread
    • amp anxiety life st70 tube valve
    • Replies: 134
    • Forum: Tube Audio
  14. zastin17

    Dynaco ST-70, What an Amazing Amp!!

    So I got myself an early Christmas present. And I am very happy I did!! What an incredible midrange, and beautifull highs. So diffrent from anything I've heared, but is so fun to listen too. Sooo holographic, so mutch coherent texture. The sound has a physical presence that is very, very real...
  15. M

    Baldwin organ model 5A tube amps to rebuild for home hi-fi use

    I was able to pick these up for a song. I have two of each. They came out of a sort of working Baldwin 5a organ. Sort of working as in the tubes all fired up but the volume was exceptionally low. Now what I would like to do is convert them over to home hi-fi use. Not sure what I have but I...
  16. J

    Capehart Smoking

    Hello, Im new to Audio Karma. I had an old Capehart that was passed down to me from my grandparents. It worked for a while, but recently when plugged in it started smoking. When I plug it in now it doesn't do anything. Any idea what to target here for repair? Thanks! Josh
  17. Fasturd

    Lafayette KT-550 stereo tube amp potential purchase.

    First time dollars and sense poster... I have an opportunity to purchase a Lafayette Stereo 550 or KT-550. I think they are the same except the KT is the kit built version. Anyway I am having trouble determining what is a reasonable price to pay? The amp may have had some minor servicing done...
  18. B

    Replace power cord of fisher x 100b to 3 prong. Good idea?

    Hello, I have a working all original Fisher x100b, I took it to our local tube tech and he mentioned that he was getting some grounding noise out of the speakers when moving the unit or touching the faceplate. He suggested replacing the power cord with a three prong one. Is this worth doing or...
  19. C

    What cartridge/ needles do I need?

    I am new to Hifi systems. I kinda got in over my head. I work on guitar amplifies. Mostly vintage tube amplifies. A friend asked me to look at this old console stereo. It's an Firestone Air Chief 13R10. I replaced all the wax caps with poly caps, installed new electrolytic caps, new...
  20. rockbillboa

    Anyone in/around Idaho repair tube turntables?

    Hi folks, I'm trying to get an old suitcase tube turntable repaired. It's a GE RP1170A, from around 1962-65 I believe. Had it working last time I pulled it out about 5 years ago, but (if I remember correctly) one speaker was not working and the other was very quiet. Finally getting around to...
    • rockbillboa
    • Thread
    • boise ge general electric idaho record player repair tube turntable
    • Replies: 4
    • Forum: Tube Audio
  21. marantzgrail

    Rogers Tube HELP! 6H6M

    Good day all! I have purchased a large number of tubes over the past many years, I've forgotten about one in particular that I have quite a few in NOS shape, with a black steel casing that is rough is rough to the touch... even the packaging is mint! These radio tubes are made by Rogers after...
  22. lattiboy

    Tube DAC (or preamp) with auto off feature?

    Hi all, I’m looking to get a tube DAC I don’t have to worry about leaving on. Is there anything you folks can recommend? If not, is there a 3rd party “sound sensor” that can toggle power off and on anything!
    • lattiboy
    • Thread
    • dac tube
    • Replies: 3
    • Forum: DACs
  23. James Cox

    Sansui 1000a rectifier value

    Hi, im working on restoring a Sansui 1000a. Ive got the parts list together except i cant figure out what value i need to getnfor the rectifier diodes. Tried searching but came up empty. Any suggestions?
  24. A

    Problem with Avalon 737sp (sound clips available)

    Hello all, I've lurked around this site for years without an account, occasionally solving some issues in the studio by reading through the threads. I couldn't find one for the issue I'm having, so I figured I'd reach out into the ether to see if any of you geniuses (no sarcasm) can lend me...
    • astronautry
    • Thread
    • avalon avalon737sp channelstrip defect maintenance repair repairquestion tube tubepreamp tubepreampchannelstrip
    • Replies: 2
    • Forum: Tube Audio
  25. artsybob

    Realistic SAF-40D Right Channel Problem

    My Realistic SAF-40D tube integrated amp was working flawlessly for the three years since I had it recapped. However, my right channel speaker cut out a few weeks ago. No sound will come out of it though both channels come in clearly through my headphones. I thought it might have been the...
    • artsybob
    • Thread
    • 7189 amplifier integrated amp japanese tube amplifier radio shack realistic saf-40d tube
    • Replies: 2
    • Forum: Tube Audio
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